Total solar eclipse on August 12, 2026 will bring rare visual phenomena to Europe
The sky of continental Europe is preparing for an astronomical event of rare beauty and complexity on August 12, 2026. The date marks the first total solar eclipse visible in the region in 27 years, promising a spectacle that goes far beyond simple daytime darkness. Observers in Iceland, Greenland and Spain will have the opportunity to witness a series of phenomena that transform the experience into something unforgettable.
Phenomena to observe during the solar eclipse phases
More on this story: Watch the 2026 Total Solar Eclipse
The transition from light to dark during a total solar eclipse is a gradual process, full of visual details that many are unaware of. From the first contact, when the Moon begins to cover the Sun, until the last, there is a sequence of events worthy of attention. It is essential, in all partial phases, to use ISO certified sun protection glasses to ensure eye safety.
Learn more: Total solar eclipse show on August 12, 2026: check out where to observe safely
- Observers may notice:
- Sunspots:With adequate protection, it is possible to identify the dark spots on the Sun’s surface, which are colder regions with intense magnetic fields, as the Moon’s silhouette advances.
- Visible planets:Approximately 15 minutes before totality, some planets become visible. Jupiter will be to the west-northwest, followed by Mercury. Venus will appear to the east-southeast, while more distant Mars can be seen in the west.
- Rising shadows:In phases of partial eclipse, when more than 50% of the Sun is covered, the cracks of light that pass through tree leaves or objects with small holes (such as a colander) cast crescent-shaped shadows on the ground.
The curious shadow bands and the change in the environment
As the eclipse progresses, some more subtle phenomena manifest themselves, transforming the atmosphere and surrounding environment. These changes prepare the observer for the climax of totality.
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A few minutes before and after totality, so-called shadow bands or “shadow snakes” can be observed. They manifest as clear, wavy lines on white surfaces, the result of the refraction of increasing sunlight by atmospheric turbulence. This phenomenon is especially notable when the Sun is low in the sky, as will be the case in Spain. Another perception is the sudden drop in temperature and ambient luminosity, which creates a sensation of deep twilight and even a slight chill, an experience different from any ordinary sunset. Additionally, the Moon’s shadow can be seen running across the horizon, although it is a difficult phenomenon to capture without an elevated position. Its speed varies between 3,500 km/h in Greenland and Iceland, and 19,300 km/h in eastern Spain.
The Magic of Totality: Diamond Rings and the Solar Crown
The most anticipated moments of a total solar eclipse are those that mark the beginning and end of totality, when the solar disk is completely covered by the Moon.
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- Diamond Rings and Baily Beads:Just before totality, a bright point of light, the “diamond ring,” forms as the last ray of sunlight passes through the valleys of the Moon. This point quickly splits into small “Baily beads,” which are lingering glows at different points on the lunar edge. The disappearance of Baily’s last account marks the beginning of totality. The process reverses at the end of totality, with the appearance of the second round of diamond rings, signaling the need to replace the goggles.
- The solar corona:During totality, the solar corona, the Sun’s tenuous, superheated outer atmosphere, reveals itself as a silvery-white halo around the Moon’s dark silhouette. This is the highlight of the show, when eclipse glasses can be safely removed for a stunning view. The corona is a region where solar flares and coronal mass ejections originate, making observation a rare privilege.
- Chromosphere and prominences:For brief moments at the beginning and end of totality, a reddish line, the chromosphere, can be seen around the solar edge. Within it, or projecting towards the crown, prominences appear, structures of bright plasma in the form of pinkish loops or spikes. They are particularly visible in periods of maximum solar activity, such as the current one.
Unique celestial events: meteor shower and northern lights
The August 12, 2026 eclipse offers a unique conjunction with other astronomical events, further elevating observation potential.
By a remarkable coincidence, the eclipse will occur just hours before the annual peak of the Perseid meteor shower. Observers in regions with darker nights, such as rural Spain, will be able to see between 20 and 40 “shooting stars” per hour after midnight as early as August 13. While it is unlikely to see a meteor during totality – as the focus will be on the solar corona – the opportunity to combine the two events is rare. For those in Iceland and Greenland, there is a chance, albeit small, of witnessing the Northern Lights during totality. The darkness of the eclipse, although not complete like deep night, may allow the green bands of the aurora to be seen, especially since August is a time when auroras are already relatively common in these latitudes.
